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How TikTok Grew from a Fun App for Teens into a Potential National Security Threat

A TikTok logo is shown on a phone in San Francisco, Friday, Jan. 17, 2025. (AP)
A TikTok logo is shown on a phone in San Francisco, Friday, Jan. 17, 2025. (AP)
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How TikTok Grew from a Fun App for Teens into a Potential National Security Threat

A TikTok logo is shown on a phone in San Francisco, Friday, Jan. 17, 2025. (AP)
A TikTok logo is shown on a phone in San Francisco, Friday, Jan. 17, 2025. (AP)

If it feels like TikTok has been around forever, that's probably because it has, at least if you're measuring via internet time. What's now in question is whether it will be around much longer and, if so, in what form?

Starting in 2017, when the Chinese social video app merged with its competitor Musical.ly, TikTok has grown from a niche teen app into a global trendsetter. While, of course, also emerging as a potential national security threat, according to US officials.

On April 24, President Joe Biden signed legislation requiring TikTok parent ByteDance to sell to a US owner within a year or to shut down. TikTok and its China-based parent company, ByteDance, filed a lawsuit against the US, claiming the security concerns were overblown and the law should be struck down because it violates the First Amendment.

The Supreme Court on Friday unanimously upheld the federal law banning TikTok, and the popular short form video service went dark in the US just hours before the ban was set to begin.

Here's how TikTok came to this juncture:

March 2012 ByteDance is founded in China by entrepreneur Zhang Yimin. Its first hit product is Toutiao, a personalized news aggregator for Chinese users.

July 2014 Startup Musical.ly, later known for an eponymous app used to post short lipsyncing music videos, is founded in China by entrepreneur Alex Zhu.

July 2015 Musical.ly hits #1 in the Apple App Store, following a design change that made the company's logo visible when users shared their videos.

2016 ByteDance launches Douyin, a video sharing app for Chinese users. Its popularity inspires the company to spin off a version for foreign audiences called TikTok.

November 2017 ByteDance acquires Musical.ly for $1 billion. Nine months later, ByteDance merges it with TikTok.

Powered by an algorithm that encourages binge-watching, users begin to share a wide variety of videos on the app, including dance moves, kitchen food preparation and various “challenges” to perform, record and post acts that range from serious to satirical.

February 2019 Rapper Lil Nas X releases the country-trap song “Old Town Road” on TikTok, where it goes viral and pushes the song to a record 17 weeks in the #1 spot on the Billboard Hot 100 chart. The phenomenon kicks off a wave of TikTok videos from musical artists who suddenly see TikTok as a critical way to reach fans.

TikTok settles federal charges of violating US child-privacy laws and agrees to pay a $5.7 million fine.

September 2019 The Washington Post reports that while images of Hong Kong democracy protests and police crackdowns are common on most social media sites, they are strangely absent on TikTok. The same story notes that TikTok posts with the #trump2020 tag received more than 70 million views.

The company insists that TikTok content moderation, conducted in the US, is not responsible and says the app is a place for entertainment, not politics.

The Guardian reports on internal documents that reportedly detail how TikTok instructs its moderators to delete or limit the reach of videos touching on topics sensitive to China such as the 1989 Tiananmen Square protests and subsequent massacre.

October 2019 US politicians begin to raise alarms about TikTok's influence, calling for a federal investigations of its Musical.ly acquisition and a national security probe into TikTok and other Chinese-owned apps. That investigation begins in November, according to news reports.

December 2019 The Pentagon recommends that all US military personnel delete TikTok from all phones, personal and government-issued. Some services ban the app on military owned phones. In January, the Pentagon bans the app from all military phones.

TikTok becomes the second-most downloaded app in the world, according to data from analytics firm SensorTower.

May 2020 Privacy groups file a complaint alleging TikTok is still violating US child-protection laws and flouting a 2019 settlement agreement. The company “takes the issue of safely seriously” and continues to improve safeguards, it says.

TikTok hires former Disney executive Kevin Mayer as its chief executive officer in an apparent attempt to improve its US relations. Mayer resigns three months later.

July 2020 India bans TikTok and dozens of other Chinese apps in response to a border clash with China.

President Donald Trump says he is considering banning TikTok as retaliation for China's alleged mishandling of the COVID-19 pandemic.

August 2020 Trump issues a sweeping but vague executive order banning American companies from any “transaction” with ByteDance and its subsidiaries, including TikTok. Several days later, he issues a second order demanding that ByteDance divest itself of TikTok's US operations within 90 days.

Microsoft confirms it is exploring acquisition of TikTok. The deal never materializes; neither does a similar overture from Oracle and Walmart. TikTok, meanwhile, sues the Trump administration for alleged violation of due process in its executive orders.

November 2020 Joe Biden is elected president. He doesn't offer a new policy on TikTok and won't take office until January, but Trump's plans to force a sale of TikTok start to unravel anyway. The Trump administration extends the deadlines it had imposed on ByteDance and TikTok and eventually lets them slide altogether.

February 2021 Newly sworn-in President Joe Biden postpones the legal cases involving Trump's plan to ban TikTok, effectively bringing them to a halt.

September 2021 TikTok announces it has more than a billion monthly active users.

December 2021 A Wall Street Journal report finds TikTok algorithms can flood teens with a torrent of harmful material such as videos recommending extreme dieting, a form of eating disorder.

February 2022 TikTok announces new rules to deter the spread of harmful material such as viral hoaxes and promotion of eating disorders.

April 2022 “The Unofficial Bridgerton Musical,” a project created by two fans of the Netflix show as a TikTok project, wins the Grammy for Best Musical Theater Album.

TikTok becomes the most downloaded app in the world, beating out Instagram, according to SensorTower data.

June 2022 BuzzFeed reports that China-based ByteDance employees have repeatedly accessed the nonpublic information of TikTok users, based on leaked recordings from more than 80 internal TikTok meetings. TikTok responds with a vague comment touting its commitment to security that doesn't directly address the BuzzFeed report.

TikTok also announces it has migrated its user data to US servers managed by the US tech firm Oracle. But that doesn't prevent fresh alarm among US officials about the risk of Chinese authorities accessing US user data.

December 2022 FBI Director Christopher Wray raises national security concerns about TikTok, warning that Chinese officials could manipulate the app's recommendation algorithm for influence operations.

ByteDance also said it fired four employees who accessed data on journalists from Buzzfeed News and The Financial Times while attempting to track down leaks of confidential materials about the company.

February 2023 The White House gives federal agencies 30 days to ensure TikTok is deleted from all government-issued mobile devices. Both the FBI and the Federal Communications Commission warn that ByteDance could share TikTok user data with China’s authoritarian government.

March 2023 Legislators grill TikTok CEO Shou Zi Chew at a six-hour congressional hearing where Chew, a native of Singapore, attempts to push back on assertions that TikTok and ByteDance are tools of the Chinese government.

January 2024 TikTok said it was restricting a tool some researchers use to analyze popular videos on the platform.

March 2024 A bill to ban TikTok or force its sale to a US company gathers steam in Congress. TikTok brings dozens of its creators to Washington to tell lawmakers to back off, while emphasizing changes the company has made to protect user data. TikTok also annoys legislators by sending notifications to users urging them to “speak up now” or risk seeing TikTok banned; users then flood congressional offices with calls.

The House of Representatives passes the TikTok ban-or-sell bill.

April 2024 The Senate follows suit, sending the bill to President Biden, who signs it.

May 2024 TikTok and its Chinese parent company ByteDance sue the US federal government to challenge a law that would force the sale of ByteDance’s stake or face a ban, saying that the law is unconstitutional.

June 2024 Former President Donald Trump joins TikTok and begins posting campaign-related content.

July 2024 Vice President Kamala Harris joins TikTok and also begins posting campaign-related material.

Dec. 6, 2024 A federal appeals court panel unanimously upheld a law that could lead to a ban on TikTok, handing a resounding defeat to the popular social media platform as it fights for its survival in the US. The panel of judges rebuffed the company’s challenge of the statute, which it argued had ran afoul of the First Amendment.

Dec. 27, 2024 President-elect Donald Trump asked the Supreme Court to pause the potential TikTok ban from going into effect until his administration can pursue a “political resolution” to the issue.

Jan. 17, 2025 The Supreme Court unanimously upheld the federal law banning TikTok beginning unless it’s sold by its China-based parent company, holding that the risk to national security posed by its ties to China overcomes concerns about limiting speech by the app. A ban is set to into effect on Jan. 19, 2025.

Jan. 18, 2025 TikTok users in the United States were prevented from watching videos on the popular social media platform just hours before a federal ban was set to take effect.

“A law banning TikTok has been enacted in the US,” a message in the app said. “Unfortunately, that means you can’t use TikTok for now.”

The company’s app was also removed from prominent app stores, including the ones operated by Apple and Google, while its website told users that the short-form video platform was no longer available.

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Technology

New Process for Stable, Long-Lasting Batteries

The image shows a test cell used to fabricate and test the all-solid-state battery developed at PSI. (Paul Scherrer Institute PSI/Mahir Dzambegovic) 
The image shows a test cell used to fabricate and test the all-solid-state battery developed at PSI. (Paul Scherrer Institute PSI/Mahir Dzambegovic) 
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New Process for Stable, Long-Lasting Batteries

The image shows a test cell used to fabricate and test the all-solid-state battery developed at PSI. (Paul Scherrer Institute PSI/Mahir Dzambegovic) 
The image shows a test cell used to fabricate and test the all-solid-state battery developed at PSI. (Paul Scherrer Institute PSI/Mahir Dzambegovic) 

Researchers at the Paul Scherrer Institute PSI have achieved a breakthrough on the path to practical application of lithium metal all-solid-state batteries.

The team expects the next generation of batteries to store more energy, are safer to operate, and charge faster than conventional lithium-ion batteries.

The team has reported these results in the journal Advanced Science.

All-solid-state batteries are considered a promising solution for electromobility, mobile electronics, and stationary energy storage – in part because they do not require flammable liquid electrolytes and therefore are inherently safer than conventional lithium-ion batteries.

Two key problems, however, stand in the way of market readiness: On the one hand, the formation of lithium dendrites at the anode remains a critical point.

On the other hand, an electrochemical instability – at the interface between the lithium metal anode and the solid electrolyte – can impair the battery’s long-term performance and reliability.

To overcome these two obstacles, the team led by Mario El Kazzi, head of the Battery Materials and Diagnostics group at the Paul Scherrer Institute PSI, developed a new production process:

“We combined two approaches that, together, both densify the electrolyte and stabilize the interface with the lithium,” the scientist explained.

Central to the PSI study is the argyrodite type LPSCl, a sulphide-based solid electrolyte made of lithium, phosphorus, and sulphur. The mineral exhibits high lithium-ion conductivity, enabling rapid ion transport within the battery – a crucial prerequisite for high performance and efficient charging processes.

To densify argyrodite into a homogeneous electrolyte, El Kazzi and his team did incorporate the temperature factor, but in a more careful way: Instead of the classic sintering process, they chose a gentler approach in which the mineral was compressed under moderate pressure and at a moderate temperature of only about 80 degrees Celsius.

The result is a compact, dense microstructure resistant to the penetration of lithium dendrites. Already, in this form, the solid electrolyte is ideally suited for rapid lithium-ion transport.

To ensure reliable operation even at high current densities, such as those encountered during rapid charging and discharging, the all-solid-state cell required further modification.

For this purpose, a coating of lithium fluoride (LiF), only 65 nanometres thick, was evaporated under vacuum and applied uniformly to the lithium surface – serving as a ultra-thin passivation layer at the interface between the anode and the solid electrolyte.

In laboratory tests with button cells, the battery demonstrated extraordinary performance under demanding conditions.

“Its cycle stability at high voltage was remarkable,” said doctoral candidate Jinsong Zhang, lead author of the study.

After 1,500 charge and discharge cycles, the cell still retained approximately 75% of its original capacity.

This means that three-quarters of the lithium ions were still migrating from the cathode to the anode. “An outstanding result. These values are among the best reported to date.”

Zhang therefore sees a good chance that all-solid-state batteries could soon surpass conventional lithium-ion batteries with liquid electrolyte in terms of energy density and durability.

Thus El Kazzi and his team have demonstrated for the first time that the combination of solid electrolyte mild sintering and a thin passivation layer on lithium anode effectively suppresses both dendrite formation and interfacial instability.

This combined solution marks an important advance for all-solid-state battery research – not least because it offers ecological and economic advantages: Due to the low temperatures, the process saves energy and therefore costs.

“Our approach is a practical solution for the industrial production of argyrodite-based all-solid-state batteries,” said El Kazzi. “A few more adjustments – and we could get started.”

Technology

Meta Urges Australia to Change Teen Social Media Ban

Meta has called for Australia's social media for under-16s to target app stores. Saeed KHAN / AFP
Meta has called for Australia's social media for under-16s to target app stores. Saeed KHAN / AFP
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Meta Urges Australia to Change Teen Social Media Ban

Meta has called for Australia's social media for under-16s to target app stores. Saeed KHAN / AFP
Meta has called for Australia's social media for under-16s to target app stores. Saeed KHAN / AFP

Tech giant Meta urged Australia on Monday to rethink its world-first social media ban for under-16s, while reporting that it has blocked more than 544,000 accounts under the new law.

Australia has required big platforms including Meta, TikTok and YouTube to stop underage users from holding accounts since the legislation came into force on December 10 last year.

Companies face fines of Aus $49.5 million (US$33 million) if they fail to take "reasonable steps" to comply.

Billionaire Mark Zuckerberg's Meta said it had removed 331,000 underage accounts from Instagram, 173,000 from Facebook, and 40,000 from Threads in the week to December 11.

The company said it was committed to complying with the law.

"That said, we call on the Australian government to engage with industry constructively to find a better way forward, such as incentivizing all of industry to raise the standard in providing safe, privacy-preserving, age appropriate experiences online, instead of blanket bans," it said in statement.

Meta renewed an earlier call for app stores to be required to verify people's ages and get parental approval before under-16s can download an app.

This was the only way to avoid a "whack-a-mole" race to stop teens migrating to new apps to avoid the ban, the company said.

The government said it was holding social media companies to account for the harm they cause young Australians.

"Platforms like Meta collect a huge amount of data on their users for commercial purposes. They can and must use that information to comply with Australian law and ensure people under 16 are not on their platforms," a government spokesperson said.

Meta said parents and experts were worried about the ban isolating young people from online communities, and driving some to less regulated apps and darker corners of the internet.

Initial impacts of the legislation "suggest it is not meeting its objectives of increasing the safety and well-being of young Australians", it said.

While raising concern over the lack of an industry standard for determining age online, Meta said its compliance with the Australian law would be a "multilayered process".

Since the ban, the California-based firm said it had helped found the OpenAge Initiative, a non-profit group that has launched age-verification tools called AgeKeys to be used with participating platforms.

Technology

China Is Closing in on US Technology Lead Despite Constraints, AI Researchers Say

Visitors look at robots on display at robotics company Unitree's first retail store in Beijing in January 9, 2026. (AFP)
Visitors look at robots on display at robotics company Unitree's first retail store in Beijing in January 9, 2026. (AFP)
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China Is Closing in on US Technology Lead Despite Constraints, AI Researchers Say

Visitors look at robots on display at robotics company Unitree's first retail store in Beijing in January 9, 2026. (AFP)
Visitors look at robots on display at robotics company Unitree's first retail store in Beijing in January 9, 2026. (AFP)

China can narrow its technological gap with the US driven by growing risk-taking and innovation, though the lack of advanced chipmaking tools is hobbling the sector, the country's leading artificial intelligence researchers said on Saturday.

China's so-called "AI tiger" startups MiniMax and Zhipu AI had strong debuts on the Hong Kong Stock Exchange this week, reflecting growing confidence in the sector as Beijing fast-tracks AI and chip listings to bolster domestic alternatives to advanced US technology.

Yao Shunyu, a former senior researcher at ChatGPT maker OpenAI ‌who was named ‌technology giant Tencent's chief AI scientist in December, ‌said ⁠there was a ‌high likelihood of a Chinese firm becoming the world's leading AI company in the next three to five years but said the lack of advanced chipmaking machines was the main technical hurdle.

"Currently, we have a significant advantage in electricity and infrastructure. The main bottlenecks are production capacity, including lithography machines, and the software ecosystem," Yao said at an AI conference in Beijing.

China has completed a working prototype of an extreme-ultraviolet lithography ⁠machine potentially capable of producing cutting-edge semiconductor chips that rival the West's, Reuters reported last month. However, the ‌machine has not yet produced working chips and may ‍not do so until 2030, people with ‍knowledge of the matter told Reuters.

MIND THE INVESTMENT GAP

Yao and other ‍Chinese industry leaders at the Beijing conference on Saturday also acknowledged that the US maintains an advantage in computing power due to its hefty investments in infrastructure.

"The US computer infrastructure is likely one to two orders of magnitude larger than ours. But I see that whether it's OpenAI or other platforms, they're investing heavily in next-generation research," said Lin Junyang, technical lead for Alibaba's flagship Qwen large language model.

"We, ⁠on the other hand, are relatively strapped for cash; delivery alone likely consumes the majority of our computer infrastructure," Lin said during a panel discussion at the AGI-Next Frontier Summit held by the Beijing Key Laboratory of Foundational Models at Tsinghua University.

Lin said China's limited resources have spurred its researchers to be innovative, particularly through algorithm-hardware co-design, which enables AI firms to run large models on smaller, inexpensive hardware.

Tang Jie, founder of Zhipu AI which raised HK$4.35 billion in its IPO, also highlighted the willingness of younger Chinese AI entrepreneurs to embrace high-risk ventures - a trait traditionally associated with Silicon Valley - as a positive development.

"I think if we can improve this environment, ‌allowing more time for these risk-taking, intelligent individuals to engage in innovative endeavors ... this is something our government and the country can help improve," said Tang.